iptables for webserver (CentOS 5.6 with DirectAdmin 1.39.1)

I have been hosting a couple of websites on my dedicated machine. The OS is CentOS 5.6. Until now, I have been turning iptables off since it jsut blocked all web traffic. However, I see that this is not good and that I should enable the firewall. Unforunately, I have no idea how to do that, so I am asking here what good rules for my server should be. I have of course a lot of traffic going in and out.

A few things I run on the server - DirectAdmin - Apache - php - mysql - ftp - dns - other directadmin tools (like mail, etc).

It is pretty much a开发者_如何学Go preinstalled version of DirectAdmin 1.39.1.

Please help me out.

Check out ConfigServer Security & Firewall, it's a great and very complete firewall which works pretty well with Directadmin